Management could be setting up to go private and squeeze the public shareholders out, but I really don't think the insiders have enough stock to get it done. You'll almost always get more in a sale of the Bank to a third party, but even if's an insider going-private deal, insiders will still need to pay up to get it done. You have some wealthy outside shareholders that won't be bamboozled on a low-ball offer ... I hope.
Except for the stock trading dynamics, it's not a big deal for a bank to go dark. With all of the state regulation and examination of bank financials, who cares whether they file with the SEC or not? It's a lot different when a non-bank does it.